"My doctors tell me I'm going to beat this, and I know it's true," Roberts said in a statement Monday, explaining that the disease was once known as "preleukemia." Her doctors tell her she's "younger and fitter than most people who confront this disease, and will be cured."

Roberts starts pre-treatment today, and thankfully her sister is a bone marrow match, which "greatly improves my chances for a cure," she noted.